1 Answer
Actually, a **BJT (Bipolar Junction Transistor)** is not called "unipolar." It's called **bipolar** because it involves both **types of charge carriers** (electrons and holes) in its operation.
Here’s how it works:
- **Electrons** (negative charge carriers) move through the **N-type material**.
- **Holes** (positive charge carriers) move through the **P-type material**.
In a BJT, there are two types of charge carriers at work, which is why it's called **"bipolar"**. In contrast, a **unipolar** device (like a **Field-Effect Transistor**, or **FET**) only uses **one type** of charge carrier—either electrons or holes.
So, to clarify: the **BJT** is bipolar, not unipolar.
Here’s how it works:
- **Electrons** (negative charge carriers) move through the **N-type material**.
- **Holes** (positive charge carriers) move through the **P-type material**.
In a BJT, there are two types of charge carriers at work, which is why it's called **"bipolar"**. In contrast, a **unipolar** device (like a **Field-Effect Transistor**, or **FET**) only uses **one type** of charge carrier—either electrons or holes.
So, to clarify: the **BJT** is bipolar, not unipolar.